# Koa vs Ruby on Rails

**Leader by Vioscale score:** Ruby on Rails

| Attribute | Koa | Ruby on Rails |
|---|---|---|
| **Vioscale score** | 52.9 (67% (medium)) | 66.5 (52% (medium)) |
| activity.commits_last_30d | 3 | 100 |
| adoption.dependent_repos | 109,950 | 1,358,186 |
| adoption.github_stars | 35,689 | 58,719 |
| deployment.options | - | `{"cloud":true,"self_hosted":true}` |
| description.long | Koa is a lightweight backend framework for Node.js that emphasizes simplicity and developer experience through modern async/await middleware composition, without bundling dependencies. | A Ruby-based framework bundling everything needed for web development: database management, templating engines, email delivery, real-time updates, async job handling, file storage, and built-in protections against common attacks like SQL injection and cross-site scripting. |
| features.capabilities | `{"language":"JavaScript","api_routes":true}` | `{"language":"Ruby","rendering":"ssr","api_routes":true,"typescript_first":false}` |
| language.primary | JavaScript | Ruby |
| license.spdx | MIT | MIT |
| platform.support | - | `{"mac":true,"web":true,"linux":true,"windows":true}` |
| pricing | - | `{"type":"open_source","sourceUrl":"https://rubyonrails.org","retrievedAt":"2026-08-16T21:36:16.955Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | - | free |
| release.cadence_days | 16 | - |
| release.history | `[{"url":"https://github.com/koajs/koa/releases/tag/v3.2.1","date":"2026-05-21T07:26:16Z","type":"stable","version":"v3.2.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.2.0","date":"2026-03-28T05:41:00Z","type":"stable","version":"v3.2.0"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.2","date":"2026-02-25T13:37:14Z","type":"stable","version":"v3.1.2"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.4","date":"2026-02-25T13:38:28Z","type":"stable","version":"v2.16.4"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.1","date":"2025-10-27T04:27:58Z","type":"stable","version":"v3.1.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.1.0","date":"2025-10-26T13:17:47Z","type":"stable","version":"v3.1.0"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.3","date":"2025-10-18T14:22:52Z","type":"stable","version":"v3.0.3"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.3","date":"2025-10-18T14:36:52Z","type":"stable","version":"v2.16.3"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.2","date":"2025-10-17T06:56:28Z","type":"stable","version":"v3.0.2"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.2","date":"2025-07-30T00:02:36Z","type":"stable","version":"v2.16.2"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.1","date":"2025-07-27T07:38:40Z","type":"stable","version":"v3.0.1"},{"url":"https://github.com/koajs/koa/releases/tag/v3.0.0","date":"2025-04-28T00:40:12Z","type":"stable","version":"v3.0.0"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.5","date":"2025-04-06T21:43:50Z","type":"stable","version":"3.0.0-alpha.5"},{"url":"https://github.com/koajs/koa/releases/tag/v2.16.1","date":"2025-04-06T21:41:44Z","type":"stable","version":"v2.16.1"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.4","date":"2025-03-21T07:37:11Z","type":"prerelease","version":"3.0.0-alpha.4"},{"url":"https://github.com/koajs/koa/releases/tag/2.16.0","date":"2025-02-27T05:56:03Z","type":"stable","version":"2.16.0"},{"url":"https://github.com/koajs/koa/releases/tag/2.15.4","date":"2025-02-12T14:12:11Z","type":"stable","version":"2.15.4"},{"url":"https://github.com/koajs/koa/releases/tag/3.0.0-alpha.2","date":"2024-11-04T05:10:02Z","type":"prerelease","version":"3.0.0-alpha.2"}]` | `[{"url":"https://github.com/rails/rails/releases/tag/v8.1.3.1","date":"2026-07-29T14:59:54Z","type":"stable","version":"v8.1.3.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5.1","date":"2026-07-29T15:08:22Z","type":"stable","version":"v8.0.5.1"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.2","date":"2026-07-29T15:05:22Z","type":"stable","version":"v7.2.3.2"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.3","date":"2026-03-24T20:26:02Z","type":"stable","version":"v8.1.3"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.5","date":"2026-03-24T20:19:33Z","type":"stable","version":"v8.0.5"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","date":"2026-03-23T19:42:42Z","type":"stable","version":"v8.1.2.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4.1","date":"2026-03-23T19:38:25Z","type":"stable","version":"v8.0.4.1"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3.1","date":"2026-03-23T19:32:34Z","type":"stable","version":"v7.2.3.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2","date":"2026-01-08T20:17:17Z","type":"stable","version":"v8.1.2"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.1","date":"2025-10-28T23:46:29Z","type":"stable","version":"v8.1.1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.4","date":"2025-10-28T23:43:23Z","type":"stable","version":"v8.0.4"},{"url":"https://github.com/rails/rails/releases/tag/v7.2.3","date":"2025-10-28T23:24:18Z","type":"stable","version":"v7.2.3"},{"url":"https://github.com/rails/rails/releases/tag/v7.1.6","date":"2025-10-28T23:19:19Z","type":"stable","version":"v7.1.6"},{"url":"https://github.com/rails/rails/releases/tag/v7.0.10","date":"2025-10-28T23:12:55Z","type":"stable","version":"v7.0.10"},{"url":"https://github.com/rails/rails/releases/tag/v7.0.9","date":"2025-10-28T23:02:29Z","type":"stable","version":"v7.0.9"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0","date":"2025-10-22T00:35:05Z","type":"stable","version":"v8.1.0"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0.rc1","date":"2025-10-15T00:50:43Z","type":"prerelease","version":"v8.1.0.rc1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.3","date":"2025-09-22T22:19:48Z","type":"stable","version":"v8.0.3"},{"url":"https://github.com/rails/rails/releases/tag/v8.1.0.beta1","date":"2025-09-04T12:30:05Z","type":"prerelease","version":"v8.1.0.beta1"},{"url":"https://github.com/rails/rails/releases/tag/v8.0.2.1","date":"2025-08-13T20:38:30Z","type":"stable","version":"v8.0.2.1"}]` |
| reliability.status_page | yes | - |
| security.disclosure_policy | - | yes |
| security.scorecard | 6.2 | 6.8 |
| security.vulnerabilities | `{"count":6,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=koa&per_page=100","last_12m":2,"max_severity":"CRITICAL"}` | `{"count":18,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=activesupport&per_page=100","last_12m":3,"max_severity":"CRITICAL"}` |

## Capabilities (Web Frameworks)

| Capability | Koa | Ruby on Rails |
|---|:--:|:--:|
| **Core** |  |  |
| Rendering model | - | Server-side |
| File-based routing | - | - |
| Language | JavaScript | Ruby |
| **Rendering** |  |  |
| Server components | - | - |
| Streaming SSR | - | - |
| **Fullstack** |  |  |
| Built-in API / backend routes | ✓ | ✓ |
| **DX** |  |  |
| First-class TypeScript | - | ✗ |
| Fast refresh / HMR | - | - |
| **Deployment** |  |  |
| Edge runtime support | - | - |

*Source: Vioscale. Generated 2026-09-01T15:15:16.773Z. "-" = undocumented, not absent.*